A Comprehensive Analysis for the Heterogeneous Effects on Driver Injury Severity in Single-Vehicle Passenger Car and SUV Rollover Crashes

Table 4

Estimation results for mixed ordered logit models.

Variables	Passenger car			SUV
	Coef.	Std. Err.		Coef.	Std. Err.
Male	−0.807	0.089	−9.06	−1.145	0.096	−11.90
s.d. Male	1.406	0.070	20.14	1.638	0.077	21.15
Age	0.023	0.003	7.34
s.d. Age	0.031	0.002	19.41
Safety belt use	−1.113	0.142	−7.84	−1.592	0.166	−9.58
s.d. Safety belt use				0.712	0.077	21.15
Airbag deployment	1.061	0.097	10.92	0.398	0.111	3.59
s.d. Airbag deployment	0.559	0.070	7.98	0.644	0.089	7.26
Ejection or partial ejection	4.025	0.278	14.50	3.959	0.301	13.17
Drug or alcohol use	0.957	0.199	4.82	0.596	0.211	2.83
s.d. Drug or alcohol use				1.880	0.226	8.30
Failure to drive in single lane	0.394	0.120	3.29	0.682	0.125	5.45
s.d. Failure to drive in single lane	1.158	0.115	10.07	0.751	0.116	6.49
Improper evasive action				0.339	0.109	3.12
s.d. Improper evasive action				0.802	0.097	8.28
Turning right	−1.837	0.462	−3.98
Model year	−0.017	0.008	−2.13	−0.052	0.011	−4.92
s.d. Model year				0.030	0.003	8.82
Intersection				0.384	0.060	6.37
Speed limit	0.020	0.003	7.45	0.028	0.003	8.35
s.d. Speed limit	0.009	0.001	11.65
Friday				−0.657	0.136	−4.85
s.d. Friday				1.279	0.133	9.60
August	0.436	0.165	2.64
Adverse weather conditions	−0.683	0.144	−4.74	−0.681	0.128	−5.31
Night with light	−0.500	0.134	−3.74
Rural area	−0.491	0.107	−4.60	−0.411	0.106	−4.92
s.d. Rural area	1.396	0.066	21.20	1.680	0.070	23.84
Threshold 1	1.594	0.064	24.96	1.437	0.063	22.79
Threshold 2	4.380	0.129	33.82	4.359	0.129	33.70